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نظم استرجاع المعلومات الفرقة 4 مكتبات بني سويف
1) Search engines work by using software programs called spiders or crawlers to collect information from websites and build indexes of keywords found on pages. 2) The indexes are then used by search algorithms to match queries entered by users and return relevant results. 3) The main components of a search engine are the spider that crawls and collects data, the indexer that builds indexes from the collected data, and the search software that processes queries against the indexes.
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نظم استرجاع المعلومات الفرقة 4 مكتبات بني سويف
- 1. Search Engines : Asinformation retrieval system
- 2. Search Engines Search Directories MetaSearch Engines Portals
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- 7. The Parts ofa Search Engine Spider (or “crawler”) Indexer Search software (an algorithm)
- 8. The “spider” or“crawler” The spider visits a web page, reads it, and then follows links to other pages within the site. This is what it means when someone refers to a site being "spidered" or "crawled". This is also known as “harvesting”. The spider returns to the site on a regular basis, such as every month or two, to look for changes.
- 9. 9 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting Robot Indexing Diagram Sour
- 10. The indexer Everything thespider finds goes into the second part of a search engine, the index. The index, sometimes called the catalog, is like a giant book containing a copy of every web page that the spider finds. If a web page changes, then this book is updated new information.
- 11. 11 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting Simple Index Diagram
- 12. 12 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting Search Looks Simple
- 13. 13 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting But It's Not Index ahead of time • Find files or records • Open each one and read it • Store each word in a searchable index Provide search forms • Match the query terms with words in the index • Sort documents by relevance Display results
- 14. 14 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting content search functionality user interface Search is Mostly Invisible Like an iceberg, 2/3 below water
- 15. How Search EnginesWork? 1) They collect information from selected web sites 2) The employ special software robots, called spiders, to crawl web pages 3) Spiders build lists of the words found in Web sites. 1) When a spider is building its lists, the spider is Web crawling. 4) Spiders store the lists in the engine’s database 5) The engine’s indexing software builds an index of words 6) Information is matched against query input and retrieved (processing algorithm)
- 16. 16 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting Search Processing
- 17. The Web URL1 URL2 URL3 URL4 Crawler Indexer Search Engine Database rivers? rivers. AllAbout rivers by S. I. Am
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- 27. 27 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 28. 28 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 29. 29 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 31. S E 1S E 2 S E 3 Dispatcher Display UserInterface Knowledge Personalize Query Feedback User Web
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- 34. 34 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 35. 35 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 36. Ditto - www.ditto.com FreePhoto - www.freephoto.com Amazing Image Machine - www.ncrtec.org/picture.htm Pics 4 Learning www.pics4learning.com
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- 38. Traditional text-based imagesearch engines • Manual annotation of images • Use text-based retrieval methods Water lilies Flowers in a pond <Its biological name>
- 39. QBIC – Searchby color ** Images courtesy : Yong Rao
- 40. QBIC – Searchby shape ** Images courtesy : Yong Rao
- 41. QBIC – Queryby sketch ** Images courtesy : Yong Rao
- 42. 42 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 43. Find Sounds -specialized search engine www.findsounds.com Daily Wav - www.dailywav.com Sound America - www.soundamerica.com Wav Central - www.wavecentral.com
- 44. 44 UCB SIMS 202,Sept. 2004 Avi Rappoport, Search Tools Consulting
- 45. 45 written searching spoken searching browsingtechnique terms browsing items browsing
- 46. Barry’s Clipart Server- www.barrysclipart.com Animated Gif Server - www.animatedgif.net Animation Factory - www.animfactory.com
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